Ironman gloves helped me out a bit
I was having trouble after my first long road ride on a very busy street. 15 miles of cars coming dangerously close to me and my right hand started tingling. Nothing helped, I went to an accupuntcurist (I can't spell). She did her thing and it got a lot better. She showed me a place between my index and middle finger on the back of the palm of my hand. I press down on that after every ride, and it seems to help a lot.
Also I started stretching my arms, wrist and fingers.
It seems so easy, but I'd rather do this stuff than deal with again.